chore(deps): update dependency mvdan/gofumpt to v0.6.0

[renovate]

This PR contains the following updates:

Package	Update	Change
mvdan/gofumpt	minor	v0.4.0 -> v0.6.0

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Release Notes

mvdan/gofumpt (mvdan/gofumpt)

v0.6.0

Compare Source

This release is based on Go 1.21's gofmt, and requires Go 1.20 or later.

The following changes are included:

• Support go version strings from newer go.mod files - [#​280]
• Consider simple error checks even if they use the = operator - [#​271]
• Ignore //line directives to avoid panics - [#​288]

v0.5.0

Compare Source

This release is based on Go 1.20's gofmt, and requires Go 1.19 or later.

The biggest change in this release is that we now vendor copies of the packages
go/format, go/printer, and go/doc/comment on top of cmd/gofmt itself.
This allows for each gofumpt release to format code in exactly the same way
no matter what Go version is used to build it, as Go versions can change those
three packages in ways that alter formatting behavior.

This vendoring adds a small amount of duplication when using the
mvdan.cc/gofumpt/format library, but it's the only way to make gofumpt
versions consistent in their behavior and formatting, just like gofmt.

The jump to Go 1.20's go/printer should also bring a small performance
improvement, as we contributed patches to make printing about 25% faster:

• https://go.dev/cl/412555
• https://go.dev/cl/412557
• https://go.dev/cl/424924

The following changes are included as well:

• Skip testdata dirs by default like we already do for vendor - [#​260]
• Avoid inserting newlines incorrectly in some func signatures - [#​235]
• Avoid joining some comments with the previous line - [#​256]
• Fix gofumpt -version for release archives - [#​253]

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